Laminated wrapping



July 17, 1956 o. H. HEDSTROM 2,755,213

LAMINATED WRAPPING Filed April l5, 1953 Pl. L

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United States Patent LAlWINATED WRAPPIN G Olof H. Hedstrom, Hartford City, Ind., assignor to Hartford City Paper Company, Hartford City, Ind., a corporation Application April 15, 1953, Serial No. 348,875

Claims. (Cl. 154-50) This invention relates to paper wraps, and more particularly to laminated absorbent paper wrappings.

The use of grease-resistant papers, such as glassine paper, parchment paper and the like, for wrapping foods and similar products which tend to exude grease has long been known. Such grease-proof papers have also been employedin combination with absorbent papers to provide wrappers which will not only prevent the passage of grease or fat but will also tend to prevent the accumulation of oil in droplets or pools on the inside surface of the wrapper, and its subsequent leakage through seams or holes therein.

It has commonly been noted that with the absorbent wrappers heretofore used the grease or oil which exuded from the article wrapped therein was imperfectly absorbed, in that the weight of the article when lying upon a supporting surface tended to squeeze the absorbed grease out of the pores of the absorbent paper. Further, the grease or oil so exposed to the atmosphere rapidly became rancid or developed unpleasant or unpalatable odors and flavors, thus rendering the article unusable if intended for food purposes.

It is an object of this invention to produce a laminated or multiple-ply paper wrapper which is capable of absorbing relatively large amounts of liquids. Another object of the invention is to provide a wrapper which prevents absorbed grease from being expressed from the wrapper. Another object of the invention is to provide a grease-proof Wrapper which maintains an article wrapped therein in condition free from development of objectionable odor or taste. Other objects of the invention will be apparent from the following disclosure:

In accordance with the objects of the invention, it has been found that a superior wrapper for foods and other articles which are greasy or likely to exude moisture, oil or fat can be prepared by combining an absorbent paper sheet containing diatomaceous earth as a ller with a grease resistant outer paper wrapper and/ or other paper wrapping sheets which confer desired qualities on the combination. Broadly speaking, the grease-resistant component of the new combination consists of a glassine or coated type of paper such as is well known in the art. The inner, absorbent layer of the wrapper is a filled, absorbent paper prepared by incorporating diatomaceous earth into a high grade, long fibre wood pulp under conventional conditions to produce an absorbent paper, the interstices of which are lilled with diatomaceous earth. One or both sides of the absorbent sheet may be provided with a coating of resin or size, as will be more fully described hereinafter.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims:

Fig. l is -a perspective view of a wrapper embodying the invention and composed of three sheets of paper.

Fig. 2 is a cross-sectional view of another three sheet type of wrapper embodying the invention, and having a coating on the inner side of the absorbent sheet.

t 2,755,213 ce Patented July 17, 1956 Fig. 3 is a cross-sectional view of a food product furnished with a wrapper composed of two sheets, embodying the concept of the invention.

Fig. 4 is a cross-sectional view of Ianother embodiment of the invention. In all of the drawings, the thickness of the paper sheets and the coatings has been exaggerated for the purpose of adding clarity.

In the drawings, 10 is a sheet of grease-proof paper adaptable to printing, labeling and the like, 11 is a sheet of absorbent paper containing diatomaceous earth as a filler, and 12 is a sheet of glassine paper. Referring to Fig. l, the three sheets are joined at one edge, 13, by a glue line on the adjacent surfaces of the sheets. The three sheets are employed for wrapping purposes, presenting the glassine sheet to the surface of the article to be wrapped.

In Fig. 2, 14 is a sheet of ordinary glazed or sized paper suitable for receiving three-color printing `and the like, 16 is a sheet of grease-proof paper as, for example, Patapar, parchment paper, waxed paper and the like, and 11 is a sheet of diatomaceous earth filled absorbent paper of the type described herein. 18 is a coating of a modified polyvinyl chloride, which permits the passage of oils, and prevents the absorbent paper 11 from adhering to the wrapper product. The lamina of the wrapper are represented as contiguous but are not joined. The wrapper is used as described above.

In Fig. 3, 21 is a food product which is oily or greasy in nature and subject to exudation of oil, particularly upon storage at room temperature, and wrapped with a multi-ply laminated wrapper composed of two sheets 10 and ll. The exuded grease is absorbed in sheet 11, and is prevented from escaping externally by-the sheet of grease-proof paper.

Fig. 4 represents an embodiment of the invention in which 22 is a sheet of glazed or sized paper suitable for receiving printing ink, and 25 is a sheet of absorbent paper filled with diatomaceous earth and having a layer or film 23 of polyvinyl resin on its outer surface, which renders the surface of the absorbent sheet grease-proof. 'Ihe various sheets 10, 11, 12, 14, 16, 22 and 25 of the combination wrappers of the invention can be employed in loose, unattached form, or can be glued or mechanically joined along one edge or throughout the surface thereof, as may be preferred by the user. Obviously, if desired, the coating 23 can be of a nature which will cement the lamina of the wrapper together over their entire adjacent surfaces.

The absorbent paper employed in the preparation of the laminated wrappers of the invention is composed of high grade, long-libre virgin wood pulp of the type designated as easy beating, to which has been added during the preparation of the pulp slurry from about 20 to 30% of diatomaceous earth, based upon the dry weight of the Wood pulp. Preferably the maximum amount of diatomaceous earth is used compatible with the retention of a practical degree of strength in the resulting paper. After drying and finishing, the absorbent paper can be coated on one or both sides with waxes such as parafln wax, beeswax, microcrystalline wax and the like; or with a natural or synthetic resin or gum such as shellac, rosin, polyvinyl chloride, gelatin, starch, urea-formaldehyde resin and the like, as desired, `and according to the manner in which it is desired to modify the surface characteristics of the absorbent sheet.

It has been found that when the absorbent paper filled with diatomaceous earth is used as one lamina in a multiply wrapper for food products which are subject to exudation of moisture, oils or fats, several important advantages are realized. The oil or grease is readily absorbed into the body of the sheet, Vand is not re-expressed therefrom under pressure, as is the case with ordinary absorbent paper. The absorbed oil is thus firmly held, and cannot escape from the package and stain adjacent packages when the food products are stacked or heaped. The surface of the absorbent sheet is not stained by the oils, and therefore maintains a sanitary and pleasing ap pearance at all times. The absorbed oil is also maintained in a state wherein the growth of microorganisms and the development of rancidity or offensive odors are prevented, so that the wrapped products are more perfectly preserved. Preferably the absorbent sheet is coated upon its inner side with a resin such as a porous modified polyvinyl chloride, so that it will not stick to the wrapped product. In this way, possible disintegration of the absorbent sheet through handling is prevented, whilst all of the enumerated advantages are retained.

While the invention has been illustrated and described in detail n the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiment has been shown and described and that all changes and modifications that come Within the spirit of the invention and the scope of the claims are also desired to be protected.

The invention claimed is:

1. A laminated absorbent paper wrapper comprising an outer sheet which is impermeable to grease, and an inner sheet consisting of 7() to 8O per cent of high grade wood pulp and 20 to 30 per cent of diatomaceous earth.

2. A multi-ply laminated absorbent paper wrapper comprising at least one outer greaseimpermeable layer and one inner grease-permeable layer, and containing as one lamina thereof a grease-absorbent sheet consisting of high grade easy-beating long fibre virgin pulp paper containing about 20 to 30 per cent by weight of diatomaceous earth.

3. An absorbent paper wrapper according to claim 2, in which the grease-absorbent sheet is coated upon one side thereof with a grease-permeable water-insoluble coating,

4. An absorbent paper wrapper according to claim 2, in which the grease-absorbent sheet is coated upon the outer side thereof with a grease-impermeable coating.

5. A laminated absorbent paper wrapper comprising an outer grease-proof paper lamina, an intermediate lamina of an absorbent paper filled with about 20 to 30 percent by weight of diatomaceous earth, and an inner lamina comprising grease-permeable modified polyvinyl chloride.

References Cited in the file of this patent UNITED STATES PATENTS 1,256,171 Seitz et al. Feb. l2, 1918 1,341,955 White June 1, 1920 2,041,696 Codwise May 26, 1936 2,378,193 Cummins et al June 12, 1945 2,417,924 Gary Mar. 25, 1947 2,632,723 Bennett Mar. 24, 1953 2,648,635 Brown et al. Aug. 11, 1953 

1. A LAMINATED ABSORBENT PAPER WRAPPER COMPRISING AN OUTER SHEET WHICH IS IMPERMEABLE TO GREASE, AND AN INNER SHEET CONSISTING OF 70 TO 80 PER CENT OF HIGH GRADE WOOD PULP AND 20 TO 30 PER CENT OF DIATOMACEOUS EARTH. 